Electric fields, electric potential, and capacitors

An electric field is the region around a charge where another charge feels a force. Its strength is the force per unit of charge (E = F / q), and field lines point the way a positive test charge would be pushed: outward from positive charges and inward toward negative charges, with the lines closer together where the field is stronger. Moving a positive charge against an electric field stores electric potential energy, much like lifting a ball stores gravitational potential energy. Electric potential is that energy per unit of charge, and the difference in potential between two points, measured in volts, is the voltage that drives current in a circuit: 1 volt means 1 joule of energy for each coulomb of charge. Between two parallel charged plates the field is nearly uniform. A capacitor is built this way, two conductors separated by an insulator, and it stores charge and energy. Its capacitance, measured in farads, is how much charge it stores per volt (C = Q / V). Capacitors can release their stored energy very quickly, which is how a camera flash or a defibrillator delivers a sudden burst, and they are found in almost every electronic circuit.

This explanation is AI-generated and can occasionally be wrong. 🚩 Report